Sofa



FIG. 1 is a front elevational view of a sofa showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right elevational view thereof, with a left elevational view (not shown) being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left front perspective view thereof;

FIG. 6 is a right rear perspective view thereof; and,

FIG. 7 is a right front perspective, exploded view, shown in the reclined position thereof.

The broken lines in the figures are for the purpose of illustrating portions of the sofa, which form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 